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944 lines
26 KiB
944 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/****************************************************************************/ |
|
/* |
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* linux/fs/binfmt_flat.c |
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* |
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* Copyright (C) 2000-2003 David McCullough <[email protected]> |
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* Copyright (C) 2002 Greg Ungerer <[email protected]> |
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* Copyright (C) 2002 SnapGear, by Paul Dale <[email protected]> |
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* Copyright (C) 2000, 2001 Lineo, by David McCullough <[email protected]> |
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* based heavily on: |
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* |
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* linux/fs/binfmt_aout.c: |
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* Copyright (C) 1991, 1992, 1996 Linus Torvalds |
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* linux/fs/binfmt_flat.c for 2.0 kernel |
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* Copyright (C) 1998 Kenneth Albanowski <[email protected]> |
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* JAN/99 -- coded full program relocation ([email protected]) |
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*/ |
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
|
|
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/mm.h> |
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#include <linux/mman.h> |
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#include <linux/errno.h> |
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#include <linux/signal.h> |
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#include <linux/string.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/ptrace.h> |
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#include <linux/user.h> |
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#include <linux/slab.h> |
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#include <linux/binfmts.h> |
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#include <linux/personality.h> |
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#include <linux/init.h> |
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#include <linux/flat.h> |
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#include <linux/uaccess.h> |
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#include <linux/vmalloc.h> |
|
|
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#include <asm/byteorder.h> |
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#include <asm/unaligned.h> |
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#include <asm/cacheflush.h> |
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#include <asm/page.h> |
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#include <asm/flat.h> |
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|
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#ifndef flat_get_relocate_addr |
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#define flat_get_relocate_addr(rel) (rel) |
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#endif |
|
|
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/****************************************************************************/ |
|
|
|
/* |
|
* User data (data section and bss) needs to be aligned. |
|
* We pick 0x20 here because it is the max value elf2flt has always |
|
* used in producing FLAT files, and because it seems to be large |
|
* enough to make all the gcc alignment related tests happy. |
|
*/ |
|
#define FLAT_DATA_ALIGN (0x20) |
|
|
|
/* |
|
* User data (stack) also needs to be aligned. |
|
* Here we can be a bit looser than the data sections since this |
|
* needs to only meet arch ABI requirements. |
|
*/ |
|
#define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
|
|
|
#define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
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#define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
|
|
|
#define MAX_SHARED_LIBS (1) |
|
|
|
#ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET |
|
#define DATA_START_OFFSET_WORDS (0) |
|
#else |
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#define DATA_START_OFFSET_WORDS (MAX_SHARED_LIBS) |
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#endif |
|
|
|
struct lib_info { |
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struct { |
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unsigned long start_code; /* Start of text segment */ |
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unsigned long start_data; /* Start of data segment */ |
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unsigned long start_brk; /* End of data segment */ |
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unsigned long text_len; /* Length of text segment */ |
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unsigned long entry; /* Start address for this module */ |
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unsigned long build_date; /* When this one was compiled */ |
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bool loaded; /* Has this library been loaded? */ |
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} lib_list[MAX_SHARED_LIBS]; |
|
}; |
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|
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static int load_flat_binary(struct linux_binprm *); |
|
|
|
static struct linux_binfmt flat_format = { |
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.module = THIS_MODULE, |
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.load_binary = load_flat_binary, |
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}; |
|
|
|
|
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/****************************************************************************/ |
|
/* |
|
* create_flat_tables() parses the env- and arg-strings in new user |
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* memory and creates the pointer tables from them, and puts their |
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* addresses on the "stack", recording the new stack pointer value. |
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*/ |
|
|
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static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start) |
|
{ |
|
char __user *p; |
|
unsigned long __user *sp; |
|
long i, len; |
|
|
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p = (char __user *)arg_start; |
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sp = (unsigned long __user *)current->mm->start_stack; |
|
|
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sp -= bprm->envc + 1; |
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sp -= bprm->argc + 1; |
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if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) |
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sp -= 2; /* argvp + envp */ |
|
sp -= 1; /* &argc */ |
|
|
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current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; |
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sp = (unsigned long __user *)current->mm->start_stack; |
|
|
|
if (put_user(bprm->argc, sp++)) |
|
return -EFAULT; |
|
if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { |
|
unsigned long argv, envp; |
|
argv = (unsigned long)(sp + 2); |
|
envp = (unsigned long)(sp + 2 + bprm->argc + 1); |
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if (put_user(argv, sp++) || put_user(envp, sp++)) |
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return -EFAULT; |
|
} |
|
|
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current->mm->arg_start = (unsigned long)p; |
|
for (i = bprm->argc; i > 0; i--) { |
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if (put_user((unsigned long)p, sp++)) |
|
return -EFAULT; |
|
len = strnlen_user(p, MAX_ARG_STRLEN); |
|
if (!len || len > MAX_ARG_STRLEN) |
|
return -EINVAL; |
|
p += len; |
|
} |
|
if (put_user(0, sp++)) |
|
return -EFAULT; |
|
current->mm->arg_end = (unsigned long)p; |
|
|
|
current->mm->env_start = (unsigned long) p; |
|
for (i = bprm->envc; i > 0; i--) { |
|
if (put_user((unsigned long)p, sp++)) |
|
return -EFAULT; |
|
len = strnlen_user(p, MAX_ARG_STRLEN); |
|
if (!len || len > MAX_ARG_STRLEN) |
|
return -EINVAL; |
|
p += len; |
|
} |
|
if (put_user(0, sp++)) |
|
return -EFAULT; |
|
current->mm->env_end = (unsigned long)p; |
|
|
|
return 0; |
|
} |
|
|
|
/****************************************************************************/ |
|
|
|
#ifdef CONFIG_BINFMT_ZFLAT |
|
|
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#include <linux/zlib.h> |
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|
|
#define LBUFSIZE 4000 |
|
|
|
/* gzip flag byte */ |
|
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ |
|
#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ |
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ |
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */ |
|
#define COMMENT 0x10 /* bit 4 set: file comment present */ |
|
#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ |
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#define RESERVED 0xC0 /* bit 6,7: reserved */ |
|
|
|
static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst, |
|
long len, int fd) |
|
{ |
|
unsigned char *buf; |
|
z_stream strm; |
|
int ret, retval; |
|
|
|
pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len); |
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|
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memset(&strm, 0, sizeof(strm)); |
|
strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
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if (!strm.workspace) |
|
return -ENOMEM; |
|
|
|
buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
|
if (!buf) { |
|
retval = -ENOMEM; |
|
goto out_free; |
|
} |
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|
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/* Read in first chunk of data and parse gzip header. */ |
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ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
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|
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strm.next_in = buf; |
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strm.avail_in = ret; |
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strm.total_in = 0; |
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|
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retval = -ENOEXEC; |
|
|
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/* Check minimum size -- gzip header */ |
|
if (ret < 10) { |
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pr_debug("file too small?\n"); |
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goto out_free_buf; |
|
} |
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|
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/* Check gzip magic number */ |
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if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
|
pr_debug("unknown compression magic?\n"); |
|
goto out_free_buf; |
|
} |
|
|
|
/* Check gzip method */ |
|
if (buf[2] != 8) { |
|
pr_debug("unknown compression method?\n"); |
|
goto out_free_buf; |
|
} |
|
/* Check gzip flags */ |
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if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
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(buf[3] & RESERVED)) { |
|
pr_debug("unknown flags?\n"); |
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goto out_free_buf; |
|
} |
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|
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ret = 10; |
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if (buf[3] & EXTRA_FIELD) { |
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ret += 2 + buf[10] + (buf[11] << 8); |
|
if (unlikely(ret >= LBUFSIZE)) { |
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pr_debug("buffer overflow (EXTRA)?\n"); |
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goto out_free_buf; |
|
} |
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} |
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if (buf[3] & ORIG_NAME) { |
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while (ret < LBUFSIZE && buf[ret++] != 0) |
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; |
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if (unlikely(ret == LBUFSIZE)) { |
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pr_debug("buffer overflow (ORIG_NAME)?\n"); |
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goto out_free_buf; |
|
} |
|
} |
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if (buf[3] & COMMENT) { |
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while (ret < LBUFSIZE && buf[ret++] != 0) |
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; |
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if (unlikely(ret == LBUFSIZE)) { |
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pr_debug("buffer overflow (COMMENT)?\n"); |
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goto out_free_buf; |
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} |
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} |
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|
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strm.next_in += ret; |
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strm.avail_in -= ret; |
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|
|
strm.next_out = dst; |
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strm.avail_out = len; |
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strm.total_out = 0; |
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|
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if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { |
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pr_debug("zlib init failed?\n"); |
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goto out_free_buf; |
|
} |
|
|
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while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
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ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
|
if (ret <= 0) |
|
break; |
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len -= ret; |
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|
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strm.next_in = buf; |
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strm.avail_in = ret; |
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strm.total_in = 0; |
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} |
|
|
|
if (ret < 0) { |
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pr_debug("decompression failed (%d), %s\n", |
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ret, strm.msg); |
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goto out_zlib; |
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} |
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|
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retval = 0; |
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out_zlib: |
|
zlib_inflateEnd(&strm); |
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out_free_buf: |
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kfree(buf); |
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out_free: |
|
kfree(strm.workspace); |
|
return retval; |
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} |
|
|
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#endif /* CONFIG_BINFMT_ZFLAT */ |
|
|
|
/****************************************************************************/ |
|
|
|
static unsigned long |
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calc_reloc(unsigned long r, struct lib_info *p) |
|
{ |
|
unsigned long addr; |
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unsigned long start_brk; |
|
unsigned long start_data; |
|
unsigned long text_len; |
|
unsigned long start_code; |
|
|
|
start_brk = p->lib_list[0].start_brk; |
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start_data = p->lib_list[0].start_data; |
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start_code = p->lib_list[0].start_code; |
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text_len = p->lib_list[0].text_len; |
|
|
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if (r > start_brk - start_data + text_len) { |
|
pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
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r, start_brk-start_data+text_len, text_len); |
|
goto failed; |
|
} |
|
|
|
if (r < text_len) /* In text segment */ |
|
addr = r + start_code; |
|
else /* In data segment */ |
|
addr = r - text_len + start_data; |
|
|
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/* Range checked already above so doing the range tests is redundant...*/ |
|
return addr; |
|
|
|
failed: |
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pr_cont(", killing %s!\n", current->comm); |
|
send_sig(SIGSEGV, current, 0); |
|
|
|
return RELOC_FAILED; |
|
} |
|
|
|
/****************************************************************************/ |
|
|
|
#ifdef CONFIG_BINFMT_FLAT_OLD |
|
static void old_reloc(unsigned long rl) |
|
{ |
|
static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
|
flat_v2_reloc_t r; |
|
unsigned long __user *ptr; |
|
unsigned long val; |
|
|
|
r.value = rl; |
|
#if defined(CONFIG_COLDFIRE) |
|
ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset); |
|
#else |
|
ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset); |
|
#endif |
|
get_user(val, ptr); |
|
|
|
pr_debug("Relocation of variable at DATASEG+%x " |
|
"(address %p, currently %lx) into segment %s\n", |
|
r.reloc.offset, ptr, val, segment[r.reloc.type]); |
|
|
|
switch (r.reloc.type) { |
|
case OLD_FLAT_RELOC_TYPE_TEXT: |
|
val += current->mm->start_code; |
|
break; |
|
case OLD_FLAT_RELOC_TYPE_DATA: |
|
val += current->mm->start_data; |
|
break; |
|
case OLD_FLAT_RELOC_TYPE_BSS: |
|
val += current->mm->end_data; |
|
break; |
|
default: |
|
pr_err("Unknown relocation type=%x\n", r.reloc.type); |
|
break; |
|
} |
|
put_user(val, ptr); |
|
|
|
pr_debug("Relocation became %lx\n", val); |
|
} |
|
#endif /* CONFIG_BINFMT_FLAT_OLD */ |
|
|
|
/****************************************************************************/ |
|
|
|
static inline u32 __user *skip_got_header(u32 __user *rp) |
|
{ |
|
if (IS_ENABLED(CONFIG_RISCV)) { |
|
/* |
|
* RISC-V has a 16 byte GOT PLT header for elf64-riscv |
|
* and 8 byte GOT PLT header for elf32-riscv. |
|
* Skip the whole GOT PLT header, since it is reserved |
|
* for the dynamic linker (ld.so). |
|
*/ |
|
u32 rp_val0, rp_val1; |
|
|
|
if (get_user(rp_val0, rp)) |
|
return rp; |
|
if (get_user(rp_val1, rp + 1)) |
|
return rp; |
|
|
|
if (rp_val0 == 0xffffffff && rp_val1 == 0xffffffff) |
|
rp += 4; |
|
else if (rp_val0 == 0xffffffff) |
|
rp += 2; |
|
} |
|
return rp; |
|
} |
|
|
|
static int load_flat_file(struct linux_binprm *bprm, |
|
struct lib_info *libinfo, unsigned long *extra_stack) |
|
{ |
|
struct flat_hdr *hdr; |
|
unsigned long textpos, datapos, realdatastart; |
|
u32 text_len, data_len, bss_len, stack_len, full_data, flags; |
|
unsigned long len, memp, memp_size, extra, rlim; |
|
__be32 __user *reloc; |
|
u32 __user *rp; |
|
int i, rev, relocs; |
|
loff_t fpos; |
|
unsigned long start_code, end_code; |
|
ssize_t result; |
|
int ret; |
|
|
|
hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
|
|
|
text_len = ntohl(hdr->data_start); |
|
data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
|
bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
|
stack_len = ntohl(hdr->stack_size); |
|
if (extra_stack) { |
|
stack_len += *extra_stack; |
|
*extra_stack = stack_len; |
|
} |
|
relocs = ntohl(hdr->reloc_count); |
|
flags = ntohl(hdr->flags); |
|
rev = ntohl(hdr->rev); |
|
full_data = data_len + relocs * sizeof(unsigned long); |
|
|
|
if (strncmp(hdr->magic, "bFLT", 4)) { |
|
/* |
|
* Previously, here was a printk to tell people |
|
* "BINFMT_FLAT: bad header magic". |
|
* But for the kernel which also use ELF FD-PIC format, this |
|
* error message is confusing. |
|
* because a lot of people do not manage to produce good |
|
*/ |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
|
|
if (flags & FLAT_FLAG_KTRACE) |
|
pr_info("Loading file: %s\n", bprm->filename); |
|
|
|
#ifdef CONFIG_BINFMT_FLAT_OLD |
|
if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
|
pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
|
rev, FLAT_VERSION, OLD_FLAT_VERSION); |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
|
|
/* |
|
* fix up the flags for the older format, there were all kinds |
|
* of endian hacks, this only works for the simple cases |
|
*/ |
|
if (rev == OLD_FLAT_VERSION && |
|
(flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM))) |
|
flags = FLAT_FLAG_RAM; |
|
|
|
#else /* CONFIG_BINFMT_FLAT_OLD */ |
|
if (rev != FLAT_VERSION) { |
|
pr_err("bad flat file version 0x%x (supported 0x%lx)\n", |
|
rev, FLAT_VERSION); |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
#endif /* !CONFIG_BINFMT_FLAT_OLD */ |
|
|
|
/* |
|
* Make sure the header params are sane. |
|
* 28 bits (256 MB) is way more than reasonable in this case. |
|
* If some top bits are set we have probable binary corruption. |
|
*/ |
|
if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) { |
|
pr_err("bad header\n"); |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
|
|
#ifndef CONFIG_BINFMT_ZFLAT |
|
if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
|
pr_err("Support for ZFLAT executables is not enabled.\n"); |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
#endif |
|
|
|
/* |
|
* Check initial limits. This avoids letting people circumvent |
|
* size limits imposed on them by creating programs with large |
|
* arrays in the data or bss. |
|
*/ |
|
rlim = rlimit(RLIMIT_DATA); |
|
if (rlim >= RLIM_INFINITY) |
|
rlim = ~0; |
|
if (data_len + bss_len > rlim) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
/* Flush all traces of the currently running executable */ |
|
ret = begin_new_exec(bprm); |
|
if (ret) |
|
goto err; |
|
|
|
/* OK, This is the point of no return */ |
|
set_personality(PER_LINUX_32BIT); |
|
setup_new_exec(bprm); |
|
|
|
/* |
|
* calculate the extra space we need to map in |
|
*/ |
|
extra = max_t(unsigned long, bss_len + stack_len, |
|
relocs * sizeof(unsigned long)); |
|
|
|
/* |
|
* there are a couple of cases here, the separate code/data |
|
* case, and then the fully copied to RAM case which lumps |
|
* it all together. |
|
*/ |
|
if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { |
|
/* |
|
* this should give us a ROM ptr, but if it doesn't we don't |
|
* really care |
|
*/ |
|
pr_debug("ROM mapping of file (we hope)\n"); |
|
|
|
textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
|
MAP_PRIVATE, 0); |
|
if (!textpos || IS_ERR_VALUE(textpos)) { |
|
ret = textpos; |
|
if (!textpos) |
|
ret = -ENOMEM; |
|
pr_err("Unable to mmap process text, errno %d\n", ret); |
|
goto err; |
|
} |
|
|
|
len = data_len + extra + |
|
DATA_START_OFFSET_WORDS * sizeof(unsigned long); |
|
len = PAGE_ALIGN(len); |
|
realdatastart = vm_mmap(NULL, 0, len, |
|
PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
|
|
|
if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
|
ret = realdatastart; |
|
if (!realdatastart) |
|
ret = -ENOMEM; |
|
pr_err("Unable to allocate RAM for process data, " |
|
"errno %d\n", ret); |
|
vm_munmap(textpos, text_len); |
|
goto err; |
|
} |
|
datapos = ALIGN(realdatastart + |
|
DATA_START_OFFSET_WORDS * sizeof(unsigned long), |
|
FLAT_DATA_ALIGN); |
|
|
|
pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", |
|
data_len + bss_len + stack_len, datapos); |
|
|
|
fpos = ntohl(hdr->data_start); |
|
#ifdef CONFIG_BINFMT_ZFLAT |
|
if (flags & FLAT_FLAG_GZDATA) { |
|
result = decompress_exec(bprm, fpos, (char *)datapos, |
|
full_data, 0); |
|
} else |
|
#endif |
|
{ |
|
result = read_code(bprm->file, datapos, fpos, |
|
full_data); |
|
} |
|
if (IS_ERR_VALUE(result)) { |
|
ret = result; |
|
pr_err("Unable to read data+bss, errno %d\n", ret); |
|
vm_munmap(textpos, text_len); |
|
vm_munmap(realdatastart, len); |
|
goto err; |
|
} |
|
|
|
reloc = (__be32 __user *) |
|
(datapos + (ntohl(hdr->reloc_start) - text_len)); |
|
memp = realdatastart; |
|
memp_size = len; |
|
} else { |
|
|
|
len = text_len + data_len + extra + |
|
DATA_START_OFFSET_WORDS * sizeof(u32); |
|
len = PAGE_ALIGN(len); |
|
textpos = vm_mmap(NULL, 0, len, |
|
PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
|
|
|
if (!textpos || IS_ERR_VALUE(textpos)) { |
|
ret = textpos; |
|
if (!textpos) |
|
ret = -ENOMEM; |
|
pr_err("Unable to allocate RAM for process text/data, " |
|
"errno %d\n", ret); |
|
goto err; |
|
} |
|
|
|
realdatastart = textpos + ntohl(hdr->data_start); |
|
datapos = ALIGN(realdatastart + |
|
DATA_START_OFFSET_WORDS * sizeof(u32), |
|
FLAT_DATA_ALIGN); |
|
|
|
reloc = (__be32 __user *) |
|
(datapos + (ntohl(hdr->reloc_start) - text_len)); |
|
memp = textpos; |
|
memp_size = len; |
|
#ifdef CONFIG_BINFMT_ZFLAT |
|
/* |
|
* load it all in and treat it like a RAM load from now on |
|
*/ |
|
if (flags & FLAT_FLAG_GZIP) { |
|
#ifndef CONFIG_MMU |
|
result = decompress_exec(bprm, sizeof(struct flat_hdr), |
|
(((char *)textpos) + sizeof(struct flat_hdr)), |
|
(text_len + full_data |
|
- sizeof(struct flat_hdr)), |
|
0); |
|
memmove((void *) datapos, (void *) realdatastart, |
|
full_data); |
|
#else |
|
/* |
|
* This is used on MMU systems mainly for testing. |
|
* Let's use a kernel buffer to simplify things. |
|
*/ |
|
long unz_text_len = text_len - sizeof(struct flat_hdr); |
|
long unz_len = unz_text_len + full_data; |
|
char *unz_data = vmalloc(unz_len); |
|
if (!unz_data) { |
|
result = -ENOMEM; |
|
} else { |
|
result = decompress_exec(bprm, sizeof(struct flat_hdr), |
|
unz_data, unz_len, 0); |
|
if (result == 0 && |
|
(copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), |
|
unz_data, unz_text_len) || |
|
copy_to_user((void __user *)datapos, |
|
unz_data + unz_text_len, full_data))) |
|
result = -EFAULT; |
|
vfree(unz_data); |
|
} |
|
#endif |
|
} else if (flags & FLAT_FLAG_GZDATA) { |
|
result = read_code(bprm->file, textpos, 0, text_len); |
|
if (!IS_ERR_VALUE(result)) { |
|
#ifndef CONFIG_MMU |
|
result = decompress_exec(bprm, text_len, (char *) datapos, |
|
full_data, 0); |
|
#else |
|
char *unz_data = vmalloc(full_data); |
|
if (!unz_data) { |
|
result = -ENOMEM; |
|
} else { |
|
result = decompress_exec(bprm, text_len, |
|
unz_data, full_data, 0); |
|
if (result == 0 && |
|
copy_to_user((void __user *)datapos, |
|
unz_data, full_data)) |
|
result = -EFAULT; |
|
vfree(unz_data); |
|
} |
|
#endif |
|
} |
|
} else |
|
#endif /* CONFIG_BINFMT_ZFLAT */ |
|
{ |
|
result = read_code(bprm->file, textpos, 0, text_len); |
|
if (!IS_ERR_VALUE(result)) |
|
result = read_code(bprm->file, datapos, |
|
ntohl(hdr->data_start), |
|
full_data); |
|
} |
|
if (IS_ERR_VALUE(result)) { |
|
ret = result; |
|
pr_err("Unable to read code+data+bss, errno %d\n", ret); |
|
vm_munmap(textpos, text_len + data_len + extra + |
|
DATA_START_OFFSET_WORDS * sizeof(u32)); |
|
goto err; |
|
} |
|
} |
|
|
|
start_code = textpos + sizeof(struct flat_hdr); |
|
end_code = textpos + text_len; |
|
text_len -= sizeof(struct flat_hdr); /* the real code len */ |
|
|
|
/* The main program needs a little extra setup in the task structure */ |
|
current->mm->start_code = start_code; |
|
current->mm->end_code = end_code; |
|
current->mm->start_data = datapos; |
|
current->mm->end_data = datapos + data_len; |
|
/* |
|
* set up the brk stuff, uses any slack left in data/bss/stack |
|
* allocation. We put the brk after the bss (between the bss |
|
* and stack) like other platforms. |
|
* Userspace code relies on the stack pointer starting out at |
|
* an address right at the end of a page. |
|
*/ |
|
current->mm->start_brk = datapos + data_len + bss_len; |
|
current->mm->brk = (current->mm->start_brk + 3) & ~3; |
|
#ifndef CONFIG_MMU |
|
current->mm->context.end_brk = memp + memp_size - stack_len; |
|
#endif |
|
|
|
if (flags & FLAT_FLAG_KTRACE) { |
|
pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
|
textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
|
pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", |
|
"Load", bprm->filename, |
|
start_code, end_code, datapos, datapos + data_len, |
|
datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); |
|
} |
|
|
|
/* Store the current module values into the global library structure */ |
|
libinfo->lib_list[0].start_code = start_code; |
|
libinfo->lib_list[0].start_data = datapos; |
|
libinfo->lib_list[0].start_brk = datapos + data_len + bss_len; |
|
libinfo->lib_list[0].text_len = text_len; |
|
libinfo->lib_list[0].loaded = 1; |
|
libinfo->lib_list[0].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
|
libinfo->lib_list[0].build_date = ntohl(hdr->build_date); |
|
|
|
/* |
|
* We just load the allocations into some temporary memory to |
|
* help simplify all this mumbo jumbo |
|
* |
|
* We've got two different sections of relocation entries. |
|
* The first is the GOT which resides at the beginning of the data segment |
|
* and is terminated with a -1. This one can be relocated in place. |
|
* The second is the extra relocation entries tacked after the image's |
|
* data segment. These require a little more processing as the entry is |
|
* really an offset into the image which contains an offset into the |
|
* image. |
|
*/ |
|
if (flags & FLAT_FLAG_GOTPIC) { |
|
rp = skip_got_header((u32 __user *) datapos); |
|
for (; ; rp++) { |
|
u32 addr, rp_val; |
|
if (get_user(rp_val, rp)) |
|
return -EFAULT; |
|
if (rp_val == 0xffffffff) |
|
break; |
|
if (rp_val) { |
|
addr = calc_reloc(rp_val, libinfo); |
|
if (addr == RELOC_FAILED) { |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
if (put_user(addr, rp)) |
|
return -EFAULT; |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* Now run through the relocation entries. |
|
* We've got to be careful here as C++ produces relocatable zero |
|
* entries in the constructor and destructor tables which are then |
|
* tested for being not zero (which will always occur unless we're |
|
* based from address zero). This causes an endless loop as __start |
|
* is at zero. The solution used is to not relocate zero addresses. |
|
* This has the negative side effect of not allowing a global data |
|
* reference to be statically initialised to _stext (I've moved |
|
* __start to address 4 so that is okay). |
|
*/ |
|
if (rev > OLD_FLAT_VERSION) { |
|
for (i = 0; i < relocs; i++) { |
|
u32 addr, relval; |
|
__be32 tmp; |
|
|
|
/* |
|
* Get the address of the pointer to be |
|
* relocated (of course, the address has to be |
|
* relocated first). |
|
*/ |
|
if (get_user(tmp, reloc + i)) |
|
return -EFAULT; |
|
relval = ntohl(tmp); |
|
addr = flat_get_relocate_addr(relval); |
|
rp = (u32 __user *)calc_reloc(addr, libinfo); |
|
if (rp == (u32 __user *)RELOC_FAILED) { |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
|
|
/* Get the pointer's value. */ |
|
ret = flat_get_addr_from_rp(rp, relval, flags, &addr); |
|
if (unlikely(ret)) |
|
goto err; |
|
|
|
if (addr != 0) { |
|
/* |
|
* Do the relocation. PIC relocs in the data section are |
|
* already in target order |
|
*/ |
|
if ((flags & FLAT_FLAG_GOTPIC) == 0) { |
|
/* |
|
* Meh, the same value can have a different |
|
* byte order based on a flag.. |
|
*/ |
|
addr = ntohl((__force __be32)addr); |
|
} |
|
addr = calc_reloc(addr, libinfo); |
|
if (addr == RELOC_FAILED) { |
|
ret = -ENOEXEC; |
|
goto err; |
|
} |
|
|
|
/* Write back the relocated pointer. */ |
|
ret = flat_put_addr_at_rp(rp, addr, relval); |
|
if (unlikely(ret)) |
|
goto err; |
|
} |
|
} |
|
#ifdef CONFIG_BINFMT_FLAT_OLD |
|
} else { |
|
for (i = 0; i < relocs; i++) { |
|
__be32 relval; |
|
if (get_user(relval, reloc + i)) |
|
return -EFAULT; |
|
old_reloc(ntohl(relval)); |
|
} |
|
#endif /* CONFIG_BINFMT_FLAT_OLD */ |
|
} |
|
|
|
flush_icache_user_range(start_code, end_code); |
|
|
|
/* zero the BSS, BRK and stack areas */ |
|
if (clear_user((void __user *)(datapos + data_len), bss_len + |
|
(memp + memp_size - stack_len - /* end brk */ |
|
libinfo->lib_list[0].start_brk) + /* start brk */ |
|
stack_len)) |
|
return -EFAULT; |
|
|
|
return 0; |
|
err: |
|
return ret; |
|
} |
|
|
|
|
|
/****************************************************************************/ |
|
|
|
/* |
|
* These are the functions used to load flat style executables and shared |
|
* libraries. There is no binary dependent code anywhere else. |
|
*/ |
|
|
|
static int load_flat_binary(struct linux_binprm *bprm) |
|
{ |
|
struct lib_info libinfo; |
|
struct pt_regs *regs = current_pt_regs(); |
|
unsigned long stack_len = 0; |
|
unsigned long start_addr; |
|
int res; |
|
int i, j; |
|
|
|
memset(&libinfo, 0, sizeof(libinfo)); |
|
|
|
/* |
|
* We have to add the size of our arguments to our stack size |
|
* otherwise it's too easy for users to create stack overflows |
|
* by passing in a huge argument list. And yes, we have to be |
|
* pedantic and include space for the argv/envp array as it may have |
|
* a lot of entries. |
|
*/ |
|
#ifndef CONFIG_MMU |
|
stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */ |
|
#endif |
|
stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
|
stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
|
stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN); |
|
|
|
res = load_flat_file(bprm, &libinfo, &stack_len); |
|
if (res < 0) |
|
return res; |
|
|
|
/* Update data segment pointers for all libraries */ |
|
for (i = 0; i < MAX_SHARED_LIBS; i++) { |
|
if (!libinfo.lib_list[i].loaded) |
|
continue; |
|
for (j = 0; j < MAX_SHARED_LIBS; j++) { |
|
unsigned long val = libinfo.lib_list[j].loaded ? |
|
libinfo.lib_list[j].start_data : UNLOADED_LIB; |
|
unsigned long __user *p = (unsigned long __user *) |
|
libinfo.lib_list[i].start_data; |
|
p -= j + 1; |
|
if (put_user(val, p)) |
|
return -EFAULT; |
|
} |
|
} |
|
|
|
set_binfmt(&flat_format); |
|
|
|
#ifdef CONFIG_MMU |
|
res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); |
|
if (!res) |
|
res = create_flat_tables(bprm, bprm->p); |
|
#else |
|
/* Stash our initial stack pointer into the mm structure */ |
|
current->mm->start_stack = |
|
((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
|
pr_debug("sp=%lx\n", current->mm->start_stack); |
|
|
|
/* copy the arg pages onto the stack */ |
|
res = transfer_args_to_stack(bprm, ¤t->mm->start_stack); |
|
if (!res) |
|
res = create_flat_tables(bprm, current->mm->start_stack); |
|
#endif |
|
if (res) |
|
return res; |
|
|
|
/* Fake some return addresses to ensure the call chain will |
|
* initialise library in order for us. We are required to call |
|
* lib 1 first, then 2, ... and finally the main program (id 0). |
|
*/ |
|
start_addr = libinfo.lib_list[0].entry; |
|
|
|
#ifdef FLAT_PLAT_INIT |
|
FLAT_PLAT_INIT(regs); |
|
#endif |
|
|
|
finalize_exec(bprm); |
|
pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
|
regs, start_addr, current->mm->start_stack); |
|
start_thread(regs, start_addr, current->mm->start_stack); |
|
|
|
return 0; |
|
} |
|
|
|
/****************************************************************************/ |
|
|
|
static int __init init_flat_binfmt(void) |
|
{ |
|
register_binfmt(&flat_format); |
|
return 0; |
|
} |
|
core_initcall(init_flat_binfmt); |
|
|
|
/****************************************************************************/
|
|
|